Locomotive-exhaust and means for regulating draft.



No. 654,074. Patented July l7, I900.

W. H. PREflDERGAST.

LOGOMOTIVE EXHAUST AND MEANS FOR REGULATING DRAFT.

(Application filed Dec. 18, 1899.) (No Model.) 2 Sheets$heet l.

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Patented July I7, I900. W. H. PBENDERGAST. LOCOMOTIVE EXHAUST AND MEANS FOR BEGULATING DRAFT. (Application filed Dec. 18, 1899.)

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(No Model.)

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WVILLIAM I-I. PRENDERGAST, OF SAVANNAH, GEORGIA, ASSIGNOR OF ONE- HALF TO THEO. D. KLINE, OF SAME PLACE.

LOCOMOTlVE-EXHAUST ANDMEANS FOR REGULATING DRAFT.

SPECIFICATION forming part of Letters Patent N0. 654,074, dated July 17, 1900.

Application filed December 18, 1899. Serial IVORY 0,701. (No model.)

T0 at whom it may concern..-

Be it'known that 1, WILLIAM H. PRENDER- GAST, residing in Savannah, in the county of Chatham and State of Georgia, have invented a new and Improved Locomotive-Exhaust and Means for Regulating the Draft, of which the following is a specification.

My invention is an improvement in that class of locomotive-exhausts in which two independent steam-passages are provided, each having a valve for opening and closing it.

The details of the invention are as follows.

In the accompanying drawings, Figure 1 is a diagrammatic side view of alocomotive having my invention applied thereto. Fig. 2 is an enlarged side View and vertical section of the front portion of the locomotive boiler and smoke-stack. Fig. 3 is a vertical transverse section on the line 3 3, Fig. 2. Fig. 4 is an enlarged side view of the means for operating the valves for alternately opening and closing the exhaust-steam passages. Fig. 5 is an enlarged horizontal section on the line 5 5, Fig. 2. Fig. 6 is a plan view of the cast-metal base for the smoke-stack. Fig. 7 is a vertical section of the exhaust-steam box, showing the main valve closed and the auxiliary valve open. Fig. 8 is a perspective view of the main valve, and Fig. 9 is a vertical section of the same. Fig. 10 is a perspective view of the auxiliary valve, and Fig. 11 is a vertical section of the same.

As shown in Fig. 1, ahand-lever 1, arranged in the locomotive-cab, is connected by a rod 2 with a lever-arm 3, which is rigidly attached to a spur-gear 4:, that meshes with two similar gears 5 and 6. (See Fig. 4.) The gears 5 and 6 are keyed on shafts 7 and 8, that are arranged horizontally and carry and oscillate two valves 9 and 10, (see Fig. 2,) which are arranged in the exhaust-steam box 11 on opposite sides of the ordinary exhaust-passage 12, through which the steam from the locomotive-cylinders escapes, and thus acts on and carries along the products of combustion received from the locomotive fire-box, thereby increasing the draft in the latter.

From the exhaust-box 11 (see Figs. 2 and 3) a pipe 13 leads up to the base of the smokestack proper, 14, and alines with a tube 13, that extends vertically alongside the smokestack to the top, thus providing a separateor independent passage through which the exhaust-steam may be conducted when it is desired to avoid acceleration of the draft in the 5 5- locomotive fire-box.

The joint between the pipe 13 and castmetal base of the smoke-stack is packed with asbestos. Let it be supposed that when the cab-lever 1 and gear-arm 3 stand vertical, as

shown, the valves 9 and'lO are open, as in Fig. 2, but that by adjusting said leverl the gears & 5 6 will be rotated more or less and the valves 9 and 10 thereby rocked correspondingly and one of them closed while the other is opened still farther, as shown in Fig. 7. The valves and their transverse rockshafts 7 8 are so arranged that when the former stand vertical the side outlet 13 is closed while the outlet12' is open, so that the that the draft of a locomotive may be left unaffected,while exhaust-steam is permitted free independent discharge, o'r'that the amount of exhaust-steam allowed to enter the smokebox may be regulated at will by adjusting the valves 9 and 10 to a position intermediate of two extreme ones, (indicated in the draw ings,) and thus a complete regulation of the draft and combustion is efiected.

The valve 9 (see Figs. 10 and 11) is chambered on the rear side, and an arm 9 is inserted therein and clamped on the shaft 7 by a screw 16, while a screw 17 secures the outer end of the arm on a rod 18,that extends throughthe valve transversely. This construction provides for use of diiferent materials in the construction and attachment of the valve. The valve 10 is provided with a similar arm 10, (see Figs. 8 and 9,) which is rigidly connected with shaft 8 by a screw 19. Said valve 10 has an arc slot 20, and the transverse rod 21 ,which passes through theouter end of armlO, slides in said slot, as will be readily understood. This construction permits the valve 9 to open pipe 13 before the valve 10 begins to close passage 12, so that provision is made for free escape of exhaust-steam before shutting it entirely off from the smoke-box. In brief, the movement of valve 9is positive,while that of valve 10 is not, but waits upon the former in both opening and closing.

It will be noted the faces or outer ends of the valves are are shape to adapt them to the adjacent curves of the box 11 and to seat properly therein.

In order to admit steam behind the valves 9 and 10, and thus practically balance them, so that they may be easily operated while under pressure, I provide openings 25 (see Figs. 2 and 7) just below their pivotal ends and other holes 26 at a lower point in the sides of the walls of the exhaust-steam passage.

On the side of the smoke-stack proper, 14, which is opposite the steam-tube 3 I provide a tube 22 for exhaust from air-pumps and electric-light engines, which maybe received through the pipe 23. At the bottom of such tube 22 is a hole 24, from which a pipe leads downward to provide for drainage of water'of condensation, &c.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is"

1. The combination with the smoke-box,

exhaust-steam passage communicating with the latter, and an independent passage or outlet for exhaust-steam, of two rockingvalves applied respectively to such passages, shafts upon which said valves are mounted, spurgears keyed upon said shafts, an intermediate gear meshing therewith, and lever mechanism for operating such intermediate gear, substantially as shown and described, where by the oscillation of the intermediate gear effects the opening and closing of the two valves alternately and oppositely, as specified.

2. The combination,with the main exhaustpassage and the supplemental side exhaustpassage, of two valves 9 and 10, adapted for the respective passages, and means for operating said valves together, but successively,

one valve being constructed and arranged as specified tofully open before the'other closes, as and for the purpose specified.

3. The combination with the exhaust-steam adapted to move freely in the valve-socket, its outer end being so connected with the valve that the latter remains at rest while the rockshaft rotates a part of a revolution, as shown and described, for the purpose specified.

4. The combination with the main and supplemental exhaust-passages, of two rocking valves for opening and closing said passages, openings 26 in the sides. of the main passage, and spaces behind said valves for receiving steam for the purpose-of balancing the'val'ves, ;as shown and described.

5. The combination with theexhaust-steam passage, of a valve for closing the same, said. valve having an arc slot, and a lever-arm hav* ing a cross rod or pin working in said slot,and a rock-shaft to which said lever-arm is secured, substantially as shown and described, whereby, when the shaft is rotated, the lever-arm is moved in advance of the valve, asspecified.

6. Thecombination with the smoke-box and a steam-exhaust passage, also-an independent steam-exhaust, of two valves arranged toclose the respective passages and adapted to rock as specified, one of said valves being rigidly connected with its rockshaft and the other valve having a supplemental means of attachment to its rock-shaft, whereby it is allowed a dwell while the first-named valve is moving into or out of the closing position, as specified.

7. The combination with a locomotive smoke-stack,of an auxiliary exhaust-passage 22, a pipe for conducting the exhaust of elec* trio-light engines thereto and a pipe for conducting off the water of condensation from said passage, substantially as shown and described.

WILLIAM H. PRENDERGAST.

Witnesses:

GEO. ARTINGSTALL, WILLIAM F. OONSTANTINE. 

